bitmaps.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
1/*
2 * bitmaps.c --- routines to read, write, and manipulate the inode and
3 * block bitmaps.
4 *
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Library
9 * General Public License, version 2.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18#include <fcntl.h>
19#include <time.h>
20#if HAVE_SYS_STAT_H
21#include <sys/stat.h>
22#endif
23#if HAVE_SYS_TYPES_H
24#include <sys/types.h>
25#endif
26
27#include "ext2_fs.h"
28#include "ext2fs.h"
29#include "ext2fsP.h"
30#include "bmap64.h"
31
32void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
33{
34	ext2fs_free_generic_bmap(bitmap);
35}
36
37void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
38{
39	ext2fs_free_generic_bmap(bitmap);
40}
41
42errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
43			     ext2fs_generic_bitmap *dest)
44{
45	return (ext2fs_copy_generic_bmap(src, dest));
46}
47void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
48{
49	ext2fs_set_generic_bmap_padding(map);
50}
51
52errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
53				       const char *descr,
54				       ext2fs_inode_bitmap *ret)
55{
56	__u64		start, end, real_end;
57
58	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
59
60	fs->write_bitmaps = ext2fs_write_bitmaps;
61
62	start = 1;
63	end = fs->super->s_inodes_count;
64	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
65
66	/* Are we permitted to use new-style bitmaps? */
67	if (fs->flags & EXT2_FLAG_64BITS)
68		return (ext2fs_alloc_generic_bmap(fs,
69				EXT2_ET_MAGIC_INODE_BITMAP64,
70				fs->default_bitmap_type,
71				start, end, real_end, descr, ret));
72
73	/* Otherwise, check to see if the file system is small enough
74	 * to use old-style 32-bit bitmaps */
75	if ((end > ~0U) || (real_end > ~0U))
76		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
77
78	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
79					 start, end, real_end,
80					 descr, 0,
81					 (ext2fs_generic_bitmap *) ret));
82}
83
84errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
85				       const char *descr,
86				       ext2fs_block_bitmap *ret)
87{
88	__u64		start, end, real_end;
89
90	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
91
92	fs->write_bitmaps = ext2fs_write_bitmaps;
93
94	start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
95	end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
96	real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
97		    * (__u64) fs->group_desc_count)-1 + start;
98
99	if (fs->flags & EXT2_FLAG_64BITS)
100		return (ext2fs_alloc_generic_bmap(fs,
101				EXT2_ET_MAGIC_BLOCK_BITMAP64,
102				fs->default_bitmap_type,
103				start, end, real_end, descr, ret));
104
105	if ((end > ~0U) || (real_end > ~0U))
106		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
107
108	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
109					   start, end, real_end,
110					   descr, 0,
111					   (ext2fs_generic_bitmap *) ret));
112}
113
114/*
115 * ext2fs_allocate_block_bitmap() really allocates a per-cluster
116 * bitmap for backwards compatibility.  This function allocates a
117 * block bitmap which is truly per-block, even if clusters/bigalloc
118 * are enabled.  mke2fs and e2fsck need this for tracking the
119 * allocation of the file system metadata blocks.
120 */
121errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
122					    const char *descr,
123					    ext2fs_block_bitmap *ret)
124{
125	__u64			start, end, real_end;
126	ext2fs_generic_bitmap	bmap;
127	errcode_t		retval;
128
129	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
130
131	fs->write_bitmaps = ext2fs_write_bitmaps;
132
133	if (!fs->cluster_ratio_bits)
134		return ext2fs_allocate_block_bitmap(fs, descr, ret);
135
136	if ((fs->flags & EXT2_FLAG_64BITS) == 0)
137		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
138
139	start = fs->super->s_first_data_block;
140	end = ext2fs_blocks_count(fs->super)-1;
141	real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
142		    * (__u64) fs->group_desc_count)-1 + start;
143
144	retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
145					   fs->default_bitmap_type, start,
146					   end, real_end, descr, &bmap);
147	if (retval)
148		return retval;
149	bmap->cluster_bits = 0;
150	*ret = bmap;
151	return 0;
152}
153
154int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
155{
156	ext2fs_generic_bitmap bmap = bitmap;
157
158	if (!EXT2FS_IS_64_BITMAP(bmap))
159		return 0;
160
161	return bmap->cluster_bits;
162}
163
164errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
165					ext2_ino_t end, ext2_ino_t *oend)
166{
167	__u64 tmp_oend;
168	int retval;
169
170	retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
171					       EXT2_ET_FUDGE_INODE_BITMAP_END,
172					       end, &tmp_oend);
173	if (oend)
174		*oend = tmp_oend;
175	return retval;
176}
177
178errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
179					blk_t end, blk_t *oend)
180{
181	return (ext2fs_fudge_generic_bitmap_end(bitmap,
182						EXT2_ET_MAGIC_BLOCK_BITMAP,
183						EXT2_ET_FUDGE_BLOCK_BITMAP_END,
184						end, oend));
185}
186
187errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
188					 blk64_t end, blk64_t *oend)
189{
190	return (ext2fs_fudge_generic_bmap_end(bitmap,
191					      EXT2_ET_FUDGE_BLOCK_BITMAP_END,
192					      end, oend));
193}
194
195void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
196{
197	ext2fs_clear_generic_bmap(bitmap);
198}
199
200void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
201{
202	ext2fs_clear_generic_bmap(bitmap);
203}
204
205errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
206				     ext2fs_inode_bitmap bmap)
207{
208	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
209					     new_end, new_real_end, bmap));
210}
211
212errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
213				      ext2fs_inode_bitmap bmap)
214{
215	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
216}
217
218errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
219				     ext2fs_block_bitmap bmap)
220{
221	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
222					     new_end, new_real_end, bmap));
223}
224
225errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
226				      ext2fs_block_bitmap bmap)
227{
228	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
229}
230
231errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
232				      ext2fs_block_bitmap bm2)
233{
234	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
235					    bm1, bm2));
236}
237
238errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
239				      ext2fs_inode_bitmap bm2)
240{
241	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
242					    bm1, bm2));
243}
244
245errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
246					ext2_ino_t start, unsigned int num,
247					void *in)
248{
249	return (ext2fs_set_generic_bitmap_range(bmap,
250						EXT2_ET_MAGIC_INODE_BITMAP,
251						start, num, in));
252}
253
254errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
255					 __u64 start, size_t num,
256					 void *in)
257{
258	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
259}
260
261errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
262					ext2_ino_t start, unsigned int num,
263					void *out)
264{
265	return (ext2fs_get_generic_bitmap_range(bmap,
266						EXT2_ET_MAGIC_INODE_BITMAP,
267						start, num, out));
268}
269
270errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
271					 __u64 start, size_t num,
272					 void *out)
273{
274	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
275}
276
277errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
278					blk_t start, unsigned int num,
279					void *in)
280{
281	return (ext2fs_set_generic_bitmap_range(bmap,
282						EXT2_ET_MAGIC_BLOCK_BITMAP,
283						start, num, in));
284}
285
286errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
287					 blk64_t start, size_t num,
288					 void *in)
289{
290	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
291}
292
293errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
294					blk_t start, unsigned int num,
295					void *out)
296{
297	return (ext2fs_get_generic_bitmap_range(bmap,
298						EXT2_ET_MAGIC_BLOCK_BITMAP,
299						start, num, out));
300}
301
302errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
303					 blk64_t start, size_t num,
304					 void *out)
305{
306	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
307}
308